Electrical insulator.



.LLALLJ/ i mom @b may known vile c. um

produce a boron glass of ng are examples of the COBlpO- fluorine for 511195; rel insulators made in aocorciuse of cryoli ze, T '11 this invention; of high sili bod ce tain cases nae-g;

a s we; oute for Lon-is,

consisoing 0* iithio. an L cient of expansion 0 18:1) 45 The expansion co-eficient of composition 2. An electric insuis'toi' o A above named, is approximately 000G029, consisting of silica, boiic mi of B .00000&'(), and of $000058. It will be lithia, and an aikol noted that all of the above compositions 3. An electric inst ,3 e,

Sb;G

L L contain a comparatively large percentage of cient of expansion oi less than 0096056, so boric oXid; and that ail of them are boroand comprising the follow ng ingredients:

silicates. siIica', boric oxid Zithia, alumina. w

Insulators made from compositions of the 4. An eleciric insulator comprising the formulae above given are extremely eflicient following ngredients: silica, bonic oxid; both with high and low voitage currents iithia and alumina.

I 5. An electric insulator comprisin the following ingredients: silica, boric oxi and lithia, fused together to form a homogeneous 6. An electric insulator comprisin the following ingredients: silica, boric oxi and lithia, fused together to form a homogeneous body. I a

7'. An electric insulator formed by fusing silica, boron, oxid, lithia, alumina, and a nitrate of an alkali m'etal to form a hmogeneous body having a coefficient of expansion of'less than .0000056. a '8. An electric insulator formed by fusing silica, boron oxid, lithia, alumina material, and a nitrate of an alkali metal to form a homogeneous body.

9. An insulator formed by fusing silica,

2O boron oxid, lithia and a nitrate of an alkali metal to form a homogeneous body having a coeflicient of expansion of less than 10. An insulator formed by fusing silica; boron oxid, lithia, and a nitrate of an alkali metal to form a homogeneousbody; t

11. An electric insulator of a composition'z consisting of boric oxid, alumina, lithia, an alkali and at least 70% of silica.

12.An electric insulator comprising the following ingredients:- boric oxid, lithia, alumina and at least 7 0% of.-s'ilica.

13. An electricinsulator comprising the following ingredients: boric oxid, lithia, and at least 70% of silica fused together to form a homogeneous body.

I In witness whereof I have hereunto set my hand this 19th day of August 1916 FRED M. LOCKE.

- Witnesses:

E. O. THOMPSON, BERTHA N. SWART. 

